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With Furnace
Thermostat
R
24 VAC HOT
G
FAN
24 VAC
B/C
Common
Y1
COOL
HEATING
W1
W2
*
• Units with pigtails require wirenuts for connections. Cap all unused wires.
• In AC systems for multiple stages of heat, jumper W1 and W2 together if comfort control has only one stage of heat.
* If equipped with second stage heat
** When using a BK enabled comfort control, cut BK jumper and bypass Y and YLo at the furnace. Connect BK from comfort control to
BK of the furnace
Section 12. Electrical - High Voltage
12.1 High Voltage Power Supply
!
WARNING
LIVE ELECTRICAL COMPONENTS!
Failure to follow this Warning could result in
property damage, severe personal injury, or
death. Follow all electrical safety precautions
when exposed to live electrical components. It
may be necessary to work with live electrical
components during installation, testing, servic-
ing, and troubleshooting of this product.
The high voltage power supply must agree with
the equipment nameplate.
Check that cabling will not be subject to wear,
corrosion, excessive pressure, vibration, sharp
edges or any other adverse environmental effects.
Power wiring must comply with national, state,
and local codes.
Follow instructions on unit wiring diagram located
on the inside of the control box cover.
12
Outdoor
Furnace
Unit
R
G
B
B
Y
Y
W1
W2
With Variable Speed Furnace
Thermostat
Furnace
R
R
24 VAC HOT
G
G
FAN
24 VAC
B/C
B
Common
O
Y1
Y
COOL
**
Y
LO
W1
W1
HEATING
W2
W2
*
BK
BK
**
Outdoor
Unit
B
Y
18-AC127D1-1A-EN
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